<template>
	<view>
		<view class="search-box">
			<!-- 使用 uni-ui 提供的搜索组件 -->
			<uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0 ? true : false">
			<view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16" ></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box">
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<!-- 垃圾桶 -->
				<uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 延时器的 timerId
				timer: null,
				// 搜索关键词
				kw: '',
				// 搜索结果列表
				searchResults: [],
				// 搜索关键词的历史记录
				historyList: ['a', 'app', 'apple'],
				
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || [])
		},
		computed:{
			// 使得最新搜索在搜索历史最前
			historys(){
				return [...this.historyList].reverse()
			}
		},
		methods: {
			input(e) {
				// console.log(e) //输出搜索内容
				clearTimeout(this.timer)
				this.timer = setTimeout(() => {
					this.kw = e
					this.getSearchList()
					// console.log(this.kw)
				}, 500)
			},
			async getSearchList() {
				// 判断关键词是否为空
				if (this.kw === '') {
					this.searchResults = []
					return
				} else {
					const {
						data: res
					} = await uni.$http.get('/api/public/v1/goods/qsearch', {
						query: this.kw
					})
					if (res.meta.status !== 200) return uni.showMsg()
					this.searchResults = res.message
					this.saveSearchHistory()
				}
			},
			gotoDetail(id) {
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + id
				})
			},
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				// 先将historyList数组转为set
				const set = new Set(this.historyList)
				// 先在历史记录里删除关键词 有则删 无则跳过
				set.delete(this.kw)
				// 添加kw进历史记录
				set.add(this.kw)
				// 再将历史记录转为数组形式
				this.historyList = Array.from(set)
				// 将历史记录存入本地缓存
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			// 清空历史记录及本地缓存
			cleanHistory(){
				console.log(123)
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
	}

	.sugg-list {
		padding: 0 5px;

		.sugg-item {
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			display: flex;
			align-items: center;
			justify-content: space-between;

			.goods-name {
				// 文字不允许换行（单行文本）
				white-space: nowrap;
				// 溢出部分隐藏
				overflow: hidden;
				// 文本溢出后，使用 ... 代替
				text-overflow: ellipsis;
				margin-right: 3px;
			}
		}
	}

	.history-box {
		padding: 0 5px;

		.history-title {
			display: flex;
			justify-content: space-between;
			align-items: center;
			height: 40px;
			font-size: 13px;
			border-bottom: 1px solid #efefef;
		}

		.history-list {
			display: flex;
			flex-wrap: wrap;

			.uni-tag {
				margin-top: 5px;
				margin-right: 5px;
			}
		}
	}
</style>
